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/*
* googlesnow - run google snow firmware in user mode
*
* Copyright (C) 2013 The ChromiumOS Authors. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <stdio.h>
#include <err.h>
#include <sys/mman.h>
#include <string.h>
enum addresses {
regs = 0x10000000,
sram = 0x2020000,
sramsize = 0x77fff,
};
// 0x20234b0
main(int argc, char *argv[])
{
int fd;
int devmem;
void *regbase;
void *srambase;
void (*coreboot)(void) = (void *)0x2023400;
if (argc != 3)
errx(1, "usage: runbios rom-file start-address");
fd = open(argv[1], 2);
if (fd < 0)
err(1, argv[1]);
devmem = open("/dev/mem", 2);
if (devmem < 0)
err(1, argv[1]);
srambase = mmap((void *)sram, sramsize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
if (-1 == (int)sram)
err(1, "mmap");
memset((void *)sram, 0xff, sramsize);
/* now sort of do what bl1 does: read the 'rom' into the sram */
/* skip the bl1. We don't run it. */
if (pread(fd, coreboot, 30*1024, 0x2000) < 30*1024)
err(1, "read 'rom'");
/* you want to be in gdb at this point. */
coreboot = (void *) (strtoul(argv[2], 0, 0));
coreboot();
}
#if 0
/* cc -g googlesnow.c */
/* typical run
gdb a.out
(gdb) list 50
45 i2c = mmap((void *)0x12c60000, 0x10000, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, devmem, (off_t) 0x12c60000);
46 if (-1 == (int)i2c)
47 err(1, "mmap i2c");
48
49 /* now sort of do what bl1 does: read the 'rom' into the sram */
50 if (pread(fd, coreboot, 30*1024, 0x2000) < 30*1024)
51 err(1, "read 'rom'");
52 /* you want to be in gdb at this point. */
53 coreboot = (void *) strtoull(argv[2], 0, 0);
54 coreboot();
(gdb) br 54
Breakpoint 3 at 0x8798: file runbios.c, line 54.
(gdb) run ~/coreboot/build/coreboot.rom 0x020234b0
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /root/coreboot/util/runarmbios/a.out ~/coreboot/build/coreboot.rom 0x020234b0
Breakpoint 3, main (argc=3, argv=0x7efff7c4) at runbios.c:54
54 coreboot();
(gdb) symbol-file ~/coreboot/build/cbfs/fallback/bootblock.debug
Load new symbol table from "/root/coreboot/build/cbfs/fallback/bootblock.debug"? (y or n) y
Reading symbols from /root/coreboot/build/cbfs/fallback/bootblock.debug...done.
Error in re-setting breakpoint 3: No source file named runbios.c.
(gdb) display/i $pc
1: x/i $pc
=> 0x8798: ldr r3, [r11, #-8]
(gdb) stepi
0x0000879c in ?? ()
1: x/i $pc
=> 0x879c: blx r3
(gdb)
0x020234b0 in call_bootblock ()
1: x/i $pc
=> 0x20234b0 <call_bootblock>: ldr sp, [pc, #3800] ; 0x2024390
(gdb)
0x020234b4 in call_bootblock ()
1: x/i $pc
=> 0x20234b4 <call_bootblock+4>: bic sp, sp, #7
(gdb)
0x020234b8 in call_bootblock ()
1: x/i $pc
=> 0x20234b8 <call_bootblock+8>: mov r0, #0
(gdb)
0x020234bc in call_bootblock ()
1: x/i $pc
=> 0x20234bc <call_bootblock+12>: blx 0x20244b8 <main>
(gdb)
main (bist=0) at src/arch/arm/bootblock_simple.c:37
37 {
1: x/i $pc
=> 0x20244b8 <main>: push {r3, lr}
(gdb)
42 bootblock_mainboard_init();
1: x/i $pc
=> 0x20244ba <main+2>: bl 0x2023c08 <bootblock_mainboard_init>
(gdb)
bootblock_mainboard_init () at src/mainboard/google/snow/bootblock.c:2124
2124 {
1: x/i $pc
=> 0x2023c08 <bootblock_mainboard_init>: stmdb sp!, {r4, r5, r6, r7, r9, r10, r11, lr}
(gdb)
2127 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
1: x/i $pc
=> 0x2023c0c <bootblock_mainboard_init+4>: movs r1, #0
Note you are now debugging source, and pretty much all commands work.
*/
#endif
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